The bulge in the right middle finger may be related to tenosynovitis, epidermoid cyst or rheumatism, which can be treated by general therapy, medication or surgery. 1. Tenosynovitis: Holding a pen and writing for a long time may lead to tenosynovitis of the right middle finger, causing a bulge at the knuckle. Patients can be treated with closed needle injections, while reducing finger activities and applying hot compresses as appropriate, which can effectively relieve finger discomfort. 2. Epidermoid cysts: epidermoid cysts can also cause bulging of the right middle finger, the patient can be surgically cut the diseased area, excision of the swelling in the finger for treatment. 3. Rheumatism: Rheumatism can also cause bulging of the affected area, patients can use diclofenac sodium extended-release tablets, ibuprofen and other drugs under the guidance of the doctor for treatment. Can also be injected through the closed needle for treatment, at the same time the patient should pay attention to the hand rest, to avoid exertion. The right middle finger writing bulge, should promptly go to the hospital for examination, for the cause of treatment.